<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title></title>
    <style type="text/css">
        .wrapper {
            padding: 0 100px;
            overflow: hidden;
        }

        .col {
            position: relative;
            float: left;
        }

        .main {
            width: 100%;
            height: 200px;
            background: yellow;
        }

        .left,
        .right {
            width: 100px;
            height: 200px;
            background: red;
        }

        .left {
            margin-left: -100%;
            left: -100px;
        }

        .right {
            margin-left: -100px;
            right: -100px;
        }
    </style>
</head>

<body>
    <section class="wrapper">
        <section class="col main">main</section>
        <aside class="col left">left</aside>
        <aside class="col right">right</aside>
    </section>
</body>

</html>